Combined alarm and electric-light switch.



J. G. HARRISON. COMBINED ALARM AND ELECTRIC LIGHT SWITCH.

APPLICATION TILED MAR. 26, 1912. Patented Aug. 25, 1914.

i i humus those produced by accidental displacement,

JAMES G. HARRISON, 0F (5':OLIDIiIEIlZJJ, COL

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ORADO, ASSIGNOR 0F ONE-HALF TO UNA COY HARRISON, 0F PARKDALE', COLORADO.

- COMBINED ALARM AND ELECTRIC LIG-HT SWITCH.

Specification of Letters Iatent.

Patented Aug. 25, was.

Application filed March 26, 1912. Serial No. 68 8,50.

To all whom it may concern:

Be it known that LJAMES G. 'HARRIsoN, a citizen of the United States, residing, at Goldfield, in the county of Teller and State of Colorado, have invented "new and useful Improvements in Combined Alarm and Electric-Light Switches, of which the following is a specification.

The object of the invention hereinafter disclosed is, broadly speaking, to provide a combined alarm and electric light switch.

A more specific object of the invention is to provide a device applicable to those portions of residences, stores, oifices, furniture,

etc., in which one movable element is found in juxtaposition to an element which is fixed, relative to the movable element which device shall, on undue movement of the movable element, operate to close an electric light circuit and bell circuit. v

A further object of the invention is to provide a circuit closer which shall operate only on undue movement of the movable element to which it is juxtaposed and not on movements thereof which are unavoidable such as the force of the wind, etc.

A further object of. the invention is to provide contacts held apart by the action of a movable member as an'abutment, independent means being provided when the movable member fails to act as an abutment, adapted to press the contacts together thereby-closing an electric circuit.

In the drawings hereunto annexed, my invention is illustrated in two views.

Figure 1 is a perspective view of the device detached-from its support. Fig. 2 is a central vertical sectional view thereof showing the relations thereto of the fixed and the movable members.

Referring to the drawings for a more detailed disclosure of my invention, the same consists of a support or guide E mounted in an opening or depression formed in a fixed member W (Fig. 2). The support projects from a casing 1 fitting the depression and having an annular top partially closing the casing and forming a central opening. Telescopically mounted on the support E through the medium of a sleeve T, .is a circular disk P provided with an approximately spherical or a conical surface adapted to contact with the movable element V. The surface of the disk which contacts with the movable memwith pairs of contacts, such contacts@ and D being carried on the disk P and contacts C and C and D and D bein adapted respectively to close the electric light circuit and the bell circuit when the movable element V is suiiiciently displaced to allow the spring B to act to cause engagement of the contacts CC and D-D' as shown by broken lines in. Fig. 2. One of such circuits including conductors l and 2 connected respectively to the disk P and contact C and the other of such circuits including conductors 3 and 4 connected respectively to thedisk P and the contact B. T have therefore provided a combined alarm and electric light switch which, when applied to a window casin for instance, will permit of reasonable a ust.

ment of the window frame for ventilating purposes without causlng the annoyance resulting from the sounding of the alarm or the illumination of the room. This advan tage is maintained also when the invention is applied to-door casings in which instance, a slight swinging of the door caused, either inadvertently or through the action of the wind, will not operate to close the circuits.

As before stated, the alarm is not given unless the movable member is so unduly displaced as to permit the contacts'CC and l)lD' to be forced together by the movement of the spring actuated member P. This function is attributed to the arrangement of parts, whereby, the disk is pressed toward the movable'member and to the contour of the face of the disk. Thus, it will be seen that in contradistinction to those devices heretofore employed-wherein the contacts are rotated by a friction-wheel, a deviceis provided which needs no nice or fine adjustment and one which will allow for a reasonable displacement of the movable member without closing the circuits.

The combination with a fixed member and a movable member, the former being formed with a depression, of a casing secured in sald depression, a support fixed in said casing and rising centrally therefrom a sleeve slidably. mounted on said support, a disk carried by the upper end of the sleeve, said support limiting the movement of the sleeve and disk in. one direction, a spring cooperating with the sleeve to normally actuate the same in the upward direction, spaced independent contacts arranged in pairs, the similar contacts of each pair being carried by the disk and the remaining contacts of each pair by the casing, and independent electric circuits connected to the respective cooperating pairs of contacts, the cooperation of the respective contacts limiting movement of the disk un der the influence of the spring.

In testimony whereof I afiix my signature in presence of two Witnesses.

JAMES e. HARRISON.

Witnesses SHIRLEY HARRISON, VALENTINE GETZ. 

